Privacy question about Bittorrent File System (BTFS) - are shards of uploaded files encrypted?

I've spent a good bit of time searching PreSearch (referral link) this evening, and I haven't found an answer to a question I would like to answer.

In one form, my question is, this: "Are files stored in the BTFS network safe from inspection by the owners of the hosting devices?" Or, asked another way, are the file contents encrypted with a strong algorithm?

This web site says:

For each file uploaded to BTFS network, we divided and replicated the file into 30 shards. Thanks to Reed-Solomon encoding, the file is safe and retrievable even if 20 of the 30 shards are lost.

This web site says:

On the other hand, BTFS allows users to upload their files and the system automatically splits them into 30 seperate shards, which are hashed and hosted by 30 selected hosts, ensuring no single user has access to the entire file.

And this web site says:

Data to be on the BTFS nodes will be split into a number of file shards, then encrypted and hosted on nodes across the globe.

Here are three videos that explain Reed-Solomon codes:
1:

2

3

In the first video, it is clear that someone with access to a shard, but no access to the encoding matrix or its inverse would still be able to inspect part of the file. However, I'm not sure if that applies to all Reed-Solomon codes, or just his specific example.

So, we can say that at most, a BTFS host would only have access to inspect ¹/₃₀ of a file, maybe less. However, Reed-Solomon codes are intended for error correction, not privacy. So, back to the question, can anyone tell me how securely file shards are encrypted when stored on hosts in the BTFS network?